Refactor ITests settings in parent pom

It is desired that single 'mvn clean verify' command will run unit tests and integration tests in a single run. Parent pom should hold all shared settings across jbosstools repositories (e.g pluginCustomization, useUIThread etc ).

The problem is that unit tests require useUIThread=true, but integration tests the opposite. We need to come with a solution where we share the settings in parent pom.